Crank and yoke connection.



H. P. WELLMAN. CRANK AND YOKB GONNE CTION.

Patented Aug. 23, 1910. s sums-Ezra.

Harlan 14 9M H. P. WBLLMAN. CRANK AND YOKE CONNECTION. APPLIOATION FILED DEO.14, 1909.

' 968,437. Patented Aug. 23, 1910. 3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

HARLAN IP. WELLMAN, OF ASI-ILAND, KENTUCKY.

CRANK AND YOKE CONNECTION.

968,437, Specification of Letters Patent. Patented Aug, 23, 1910, Application filed December 14, 1909. Serial No. 532,990.

To all whom it may concern: with central openings wherein valves (not Be it known that I, HARLAN P. WELLMAN, shown) of any suitable type may be located of Ashland, in the county of Boyd and State when the apparatus is to be used as a fluid of Kentucky, have invented certain new and pump, or into which pipes may be secured useful Improvements in Crank and Yoke when it is to be used as an engine. Within 60 Connections; and I do hereby declare the the casing is located a double reciprocating following to be a full, clear, and exact depiston composed of two cylindrical piston scription of the invention, such as will enbodies which are connected by a yoke havable others skilled in the art to which it aping on one side a concaved transverse recess pertains to make and use the same. 12 and on its opposite side a wing 13 which The primary object of this invention is to fits into a guide 14. and against the inner face provide simple and highly etticient means i of a bearing plate 15. This plate is detachfor connecting a crank-shaft to the yoke of ably secured to the casing, between which a double piston, which latter may be utilized and said plate I preferably locate a series either as a pump for compressing fluid, such of thin disks 16 the number of which may 0 as air, or as an engine acting under the exbe increased or diminished by removing the pansive power of steam or the internal eX- plate to compensate for wear. plosion of natural gas or gasolene. The shaft 5 at its inner end has a disk 17 A further object is to automatically comupon which is eccentrically located a hemipensate for wear and to reduce the possispheroidal knuckle 18 which fits into the con- 75 bility of wear to a minimum; and still furcaved recess 12. To prevent excessive wear ther objects are. to employ the smallest posbetween this knuckle and the face of the sible number of moving parts; to enable recess these parts are preferably caseaccess to be readily and easily obtained; to hardened. insure efficient lubrication; and to guard Within the space 3 is located a spiral 80 against unnecessary friction. spring 19 which surrounds the shaft bearing W The invention will be hereinafter fully set and bears against a circular disk 20 of apforth and particularly pointed out in the proximately. the same diameter as disk 17, claims. and between these two disks are steel ball so In the accompanying drawings, Figure 1 bearings 21 which fit in raceways in the op- 5 is a vertical longitudinal sectional view. Fig. posed faces of the two disks. The disk 20 is 2 is a view of the pistons, crank shaft and held from rotating but is free to move lonadjacent parts removed from the casing. gitudinally of the shaft bearing. For this Fig. 3 is a cross sectional view through the purpose I preferably provide the disk 20, at yoke which connects the pistons. Fig. 4 is opposite points, with lugs 22 which by pro- 0 a similar View showing the crank disk and jecting into corresponding grooves in the the bearing plate for the yoke. Fig. 5 shows flanged portion of standard 1 form keys the crank shaft and the yoke, a second posiwhich permit the disk to be moved longition of the knuckle being indicated in dotted tudinally of the shaft under the action of the lines. Fig. 6 is a face View of the crank disk, spring but hold it from turning axially. 95 the knuckle being indicated in dotted lines. I have indicated in dotted lines, Fig. 1, Fig. 7 is a face View of the spring-pressed a belt pulley 23 on shaft 5, but any suitable disk. Fig. 8 is an elevation of the yoke and means may be employed for imparting pistons with parts in dotted lines. power to or taking it from this shaft. Referring to the drawings, 1 designates a In operation, the rotation of crank shaft 100 supporting standard which is formed with 5, acting through disk 17 and knuckle 18, a tubular portion 2 which is surrounded by effects the reciprocation of the double pisa space 3 into which opens a lubricating cup ton, the knuckle sliding back and forth in 4. lVithin the tubular port-ion 2 is mounted the transverse recess of the yoke which cona shaft 5 to which lubrication is supplied nects the pistons. If pressure is applied 105 through a port 6 in the shaft bearing. to the pistons they efiect the rotation of 7 is a cylindrical casin which is removthe shaft. The spring 19 by bear1ng against ably bolted to flanges 8 0 standard 1. The disk 20 and the latter acting on disk 17 upper and lower ends of this casing are will hold the knuckle 18 in contact with the closed by cylinder heads 9 which are formed recess in the yoke. The contact between .11C

wing 13 and guide let insures the reciprocation of the double piston on straight lines. As wear occurs the number of disks 16 may be lessened by simply removing and replacing plate 15. Of course, I may also compensate for wear by adjusting the retaining screws of plate 15. Oil being supplied to the space 3 surrounding the shaft bearing will readily find its way into the cylinder casing and thus provide ample lubrication for the reciprocating as well as the rotary parts.

The advantages of my invention will be apparent to those skilled in the art. The spring 19 acting constantly on disk 20 serves to retain the parts in perfect contact, and the knuckle 18 in the revolution of shaft 5 is always presenting a new surface to the transverse recess 12 by engagement with which the reciprocation of the yoke and pistons is effected.

While I have described the preferred manner of carrying out my invention, yet I do not restrict myself to the exact arrangement of parts, since changes may be made therein without departing from the spirit of the invention.

1 claim as my invention l. A crank and yoke connection comprising a yoke having a transverse concaved recess on one side and a guide wing on the other, an adjustable bearing for said wing, and a crank-shaft having a hemi-spheroidal knuckle fitting in said recess.

2. A crank and yoke connection comprising a yoke having a transverse concaved recess, a rotary shaft having a disk provided with an eccentrically-located knuckle fitted in said recess, and a spring acting on said shaft to hold said knuckle against the face of said recess.

3. A crank and yoke connection comprising a yoke having a transverse concaved recess, a rotary shaft having a disk provided with an eccentrically-located knuckle fitted in said recess, a second disk paralleling the first mentioned disk, ball-bearings between the two disks, and a spring serving to hold said knuckle against the face of said recess.

f. A crank and yoke connection comprising a yoke having a transverse concaved recess, a rotary shaft having a disk provided with an eccentrically-located knuckle fitted in said recess, a second disk paralleling the first mentioned disk, said second disk being held as against rotation but capable of moving longitudinally of the axis of the shaft, and a spring acting on said second disk to hold said knuckle against the face of said recess.

5. A crank and yoke connection comprising a standard having a shaft bearing and a space surrounding the latter, a yoke having a transverse concaved recess, a rotary shaft having a disk provided with an eccentrically-located knuckle fitted in said recess, a second disk adjacent to the first mentioned disk, means for holding the latter as against rotation,ball-bearings between the disks, and a spiral spring surrounding the shaft bearing and acting against said second disk.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

HARLAN P. WVELLMAN.

WVitnesses:

W. C. RICHARDSON, R. O. FISHER. 

